I analyzed two years' worth of data, consisting of over 1 million solved puzzles.
This included puzzles solved "against
the clock", of three different sizes. For each size, Chrome users were
the fastest solvers, Firefox users came second, and IE users were the
slowest. The number of abandoned puzzles (started but never finished)
was also significantly higher for IE users. Analysis shows that the
differences are statistically significant: in other words, they did
not happen by chance.